Equal versus unequal selection probabilities
{"Image DocumentName": "Equal versus unequal selection probabilities?", "Image ImageDescription": "For most surveys, each PSU has an equal probability of selection within each stratum. However, there may be cases in which selection probabilities are unequal. For example, lower selection probabilities may be assigned to units with higher data collection costs and higher selection probabilities to PSUs from small subpopulations of particular interest. These design probabilities are a feature of the survey design and are assumed known before data analysis.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}